[LeetCode] 反转字符串【344】

问题: 编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组s的形式给出

示例1

输入: s = ["h","e","l","l","o"]

输出: ["o","l","l","e","h"]

示例2

输入: s = ["H","a","n","n","a","h"]

输出: ["h","a","n","n","a","H"]

Python3解题 

# 解法1:双指针
def reverseString(s):
    left, right = 0, len(s) - 1
    while left < right:
        s[left], s[right] = s[right], s[left]
        left = left + 1
        right = right - 1
    return s

# 解法2
def reverseString(s):
    s.reverse()
    return s

# ['o', 'l', 'l', 'e', 'h']
reverseString(["h","e","l","l","o"])
# ['h', 'a', 'n', 'n', 'a', 'H']
reverseString(["H","a","n","n","a","h"])